At the New York Hilton Midtown in Manhattan, the full-service restaurant is replaced by the casual, self-serve Herb N' Kitchen

At the New York Hilton Midtown in Manhattan, waiters are out. Flatbread pizzas and salads to go are in.

The 1,981-room hotel recently replaced its breakfast-and-lunch restaurant with Herb N' Kitchen, a more casual, self-serve market. So-called grab-and-go options are becoming popular among hotel brands, including Aloft Hotels and Hyatt.

Hilton is taking a large leap. It made a media splash in May when it announced it was...